Cyanidation pre-leaching test:
Pre stirred cyanidation leaching experimentally obtained data about your arsenopyrite ores of ferrous metals. Put
The method of atomic absorption analysis using expensive gold and silver in the solution, with conventional fire assay analysis leached residue. The analysis indicated that the gold and silver recovery rates obtained from the test were 95% and 81%, respectively .
In order to determine the effect of leaching time on the recovery of gold and silver, a cyanide leaching test similar to the above was performed. In an open container
Table 2 Â Effect of leaching time on recovery of precious metals from cyanidation
Cumulative leaching time (hours) | Cumulative results of leaching (% of total) | |
gold | silver | |
twenty four | 85.00 | 78.60 |
48 | 94.70 | 84.70 |
72 | 96.40 | 88.50 |
96 | 96.90 | 90.70 |
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In order to determine the distribution of the remaining precious metals,
In the level distribution of the gold particles indicate the remaining tailings sulphide minerals closely associated with the gold, and then finely ground to improve the recovery of gold is not as -35 mesh and -325 mesh mineral leaching results are - like of. The -325 mesh has a higher silver content in the grain size, indicating that the silver component of the silver-containing mineral is not suitable for cyanidation. Top flow percolation leaching;
In order to determine whether the concentrate is suitable for cyanide leaching, a top-flow percolation leaching test was performed.
4Au+8CN - +O 2 +2H 2 O → 4Au ( CN ) 2 - +4OH -          ( 1 )
2Au+4CN - +O 2 +2H 2 O → 2Au ( CN ) 2 - +H 2 O 2 +2OH -    ( 2 )
To verify this determination, a small amount of H 2 O 2 was added to the leachate to provide oxygen for the dissolution reaction. Adding 30% H 2 0 per day of depleted liquid - ml per liter can significantly increase the dissolution rate of gold, and sodium cyanide is not greatly damaged. After leaching for 20 hours, the precious liquid contained an average of 316 ppm of gold , indicating that the gold leaching rate increased by 60% . The gold recovery obtained by a total of 96 hours of diafiltration leaching test was compared with the recovery obtained by stirred cyanidation. These results indicate that in order to achieve a satisfactory recovery rate by diafiltration cyanidation within a certain period of time, air or oxygen must be blown into the concentrate bed during the leaching process.
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